It was getting ready for a refresh or reboot anyway - nothing lasts for ever.
The TG present format has had a good long run.
JC JM and RH are all multi millionaires and will be in demand from ITV SKY etc.
Other BBC progs have lost or changed star presenters - Have I Got News For You, Film 2015, Strictly Dancing etc
Life goes on!
You know it makes sense! 
